See this fascinating brief, filed February 25 in the U.S. Supreme Court in Doe v Reed, 09-559. This is the case over whether states should make public the names and addresses of people who sign petitions.
Even if you normally don’t read briefs, consider reading this one. It is 70 pages. If you prefer to print briefs in order to read them (instead of reading them on a computer screen), and if you only want to read the text itself, you can skip printing the first 13 pages, which are various non-text Tables of Authorities.
The case will be argued in the U.S. Supreme Court on April 28.